Instantaneous - Depth measured below water line or instantaneous water body surface

Parameters

BODC CODE

Rank

Units

Short Title

Title

ADEPZZ01

1

Metres

DepBelowSurf

Depth below surface of the water body

BOTTFLAG

1

Dimensionless

C22_flag

Sampling process quality flag (BODC C22)

CPHLFLP4

1

Milligrams per cubic metre

chl-a_water>0.2um_fluor_sum_frac

Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >0.2um phase] by filtration, acetone extraction and fluorometry and summation of size-fractionated values

SAMPRFNM

1

Dimensionless

SampRef

Sample reference number

SCHLFLPF

1

Milligrams per cubic metre

chl-a_water_0.2-2um_fluor

Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate 0.2-2um phase] by filtration, acetone extraction and fluorometry

SCHLFLPG

1

Milligrams per cubic metre

chl-a_water_2-20um_fluor

Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate 2-20um phase] by filtration, acetone extraction and fluorometry

SCHLFLPQ

1

Milligrams per cubic metre

chl-a_water>20um_fluor

Concentration of chlorophyll-a {chl-a CAS 479-61-8} per unit volume of the water body [particulate >20um phase] by filtration, acetone extraction and fluorometry

Definition of Rank

Rank 1 is a one-dimensional parameter

Rank 2 is a two-dimensional parameter

Rank 0 is a one-dimensional parameter describing the second dimension of a two-dimensional parameter (e.g. bin depths for moored ADCP data)

Open Data supplied by Natural Environment Research Council (NERC)

Niskin Bottle

The Niskin bottle is a device used by oceanographers to collect subsurface seawater samples. It is a plastic bottle with caps and rubber seals at each end and is deployed with the caps held open, allowing free-flushing of the bottle as it moves through the water column.

Standard Niskin

The standard version of the bottle includes a plastic-coated metal spring or elastic cord running through the interior of the bottle that joins the two caps, and the caps are held open against the spring by plastic lanyards. When the bottle reaches the desired depth the lanyards are released by a pressure-actuated switch, command signal or messenger weight and the caps are forced shut and sealed, trapping the seawater sample.

Lever Action Niskin

The Lever Action Niskin Bottle differs from the standard version, in that the caps are held open during deployment by externally mounted stainless steel springs rather than an internal spring or cord. Lever Action Niskins are recommended for applications where a completely clear sample chamber is critical or for use in deep cold water.

Clean Sampling

A modified version of the standard Niskin bottle has been developed for clean sampling. This is teflon-coated and uses a latex cord to close the caps rather than a metal spring. The clean version of the Levered Action Niskin bottle is also teflon-coated and uses epoxy covered springs in place of the stainless steel springs. These bottles are specifically designed to minimise metal contamination when sampling trace metals.

Deployment

Bottles may be deployed singly clamped to a wire or in groups of up to 48 on a rosette. Standard bottles have a capacity between 1.7 and 30 L, while Lever Action bottles have a capacity between 1.7 and 12 L. Reversing thermometers may be attached to a spring-loaded disk that rotates through 180° on bottle closure.

Data Originator

Dr Graham Savidge, Queen's University, Belfast, UK.

Sampling strategy and methodology

Water samples were collected using Niskin bottles mounted on the CTD rosette. The samples were filtered through a cascade containing 18, 2 and 0.25 µm polycarbonate pore filters. The particulate material trapped on each filter was extracted into 90% acetone and assayed fluorometrically.

References

Tett P. and Grantham B. 1978. A simple guide to the measurement and interpretation of chlorophyll concentration, temperature and salinity, in coastal waters. SMBA. 85pp.

LOIS Shelf Edge Study (LOIS - SES)

Introduction

SES was a component of the NERC Land Ocean Interaction Study (LOIS) Community Research Programme that made intensive measurements from the shelf break in the region known as the Hebridean Slope from March 1995 to September 1996.

Scientific Rationale

SES was devoted to the study of interactions between the shelf seas and the open ocean. The specific objectives of the project were:

To identify the time and space scales of ocean-shelf momentum transmission and to quantify the contributions to ocean-shelf water exchange by physical processes.

To estimate fluxes of water, heat and certain dissolved and suspended constituents across a section of the shelf edge with special emphasis on net carbon export from, and nutrient import to, the shelf.

To incorporate process understanding into models and test these models by comparison with observations and provide a basis for estimation of fluxes integrated over time and the length of the shelf.

Fieldwork

The SES fieldwork was focussed on a box enclosing two sections across the shelf break at 56.4-56.5 °N and 56.6-56.7 °N. Moored instrument arrays were maintained throughout the experiment at stations with water depths ranging from 140 m to 1500 m, although there were heavy losses due to the intensive fishing activity in the area. The moorings included meteorological buoys, current meters, transmissometers, fluorometers, nutrient analysers (but these never returned any usable data), thermistor chains, colour sensors and sediment traps.

The moorings were serviced by research cruises at approximately three-monthly intervals. In addition to the mooring work this cruises undertook intensive CTD, water bottle and benthic surveys with cruise durations of up to 6 weeks (3 legs of approximately 2 weeks each).

Moored instrument activities associated with SES comprised current measurements in the North Channel in 1993 and the Tiree Passage from 1995-1996. These provided boundary conditions for SES modelling activities.

Additional data were provided through cruises undertaken by the Defence Evaluation and Research Agency (DERA) in a co-operative programme known as SESAME.

Data Activity

University of Wales, Bangor School of Ocean Sciences (now Bangor University School of Ocean Sciences)

Country of Organization

United Kingdom

Originator's Data Activity Identifier

CH128A_CTD_CP70

Platform Category

lowered unmanned submersible

BODC Sample Metadata Report for CH128A_CTD_CP70

Sample reference number

Nominal collection volume(l)

Bottle rosette position

Bottle firing sequence number

Minimum pressure sampled (dbar)

Maximum pressure sampled (dbar)

Depth of sampling point (m)

Bottle type

Sample quality flag

Bottle reference

Comments

83935

10.00

30.30

31.90

29.50

Niskin bottle

No problem reported

84076

10.00

303.60

305.20

300.10

Niskin bottle

No problem reported

84077

10.00

60.20

61.30

58.90

Niskin bottle

No problem reported

84078

10.00

4.80

5.70

3.90

Niskin bottle

No problem reported

84250

10.00

510.70

511.80

504.70

Niskin bottle

No problem reported

84251

10.00

203.40

204.70

200.80

Niskin bottle

No problem reported

84252

10.00

101.20

103.80

100.20

Niskin bottle

No problem reported

84253

10.00

14.30

15.60

13.50

Niskin bottle

No problem reported

Please note:the supplied parameters may not have been sampled from all the bottle firings described in the table above. Cross-match the Sample Reference Number above against the SAMPRFNM value in the data file to identify the relevant metadata.